Master-vibrator.



F. B. JOHNSON.

MASTER VIBRATOR APPLIGATION FILED JAN. 2a, 1913 Patented Feb. 10, 1914.

ATfOk/VEY rip WITNESSES:

UNITED STATES PATENT OFFICE.

FREDERICK B. JOHNSON, OF KANSAS CITY, MISSOURI, ASSIGNOR OF ONE-HALF TO GEORGE STEINHORST, OF KANSAS CITY, MISSOURI.

MASTER-VIBRATOR.

Specification of Letters Patent.

Patented Feb. 10, 1914.

To all whom it may concern Be it known that I, Fnnnnnicn B. JoHN- son, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Master,- Vibrators; and I do declare the following to beta full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the ac-- companying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This specification relates to vibrators, and more particularly to a master vibrator for use in circuit with a plurality of vibrating induction coils and has for its principal object to provide a device whereby a mast-er vibrator may be substitutedfor the vibrators of each induction coil, where a low tension magneto may be connected in circuit with the induction coils and where a battery may be connected in circuit with the induction coils.

In accomplishing this ob ect I have pro-' vided the improved details of structure hereiriafter described and illustrated in the accompanying drawings, reference now being had to the accompanying drawings, where- Figure I is a. perspective view of a vibrator III-III, Fig. 11. Fig. 1v .is a detail per-' spective view of a portion of the lower corner of the device, showing a few of the con-- tact brushes and the switch bearing. Fig. V is a wiring diagram showing the several. circuits.

Referring more in detail 't-othe parts :-1 designates a casing of any suitable material, having a hinged lid 2, attaching lugs 3, and an arc-shaped boss 4 provided with an elongated slot 5 through which the switch lever 6 is project-ed, the face of the boss being marked to designate the battery, magneto, off and master vibrator, which parts will presently be described.

'- Secured within the casing, by means of screws 7, is a plate 8 and shelf 9, of insulating material, on which parts of the vibrator are mounted. Spaced from the shelf 9 by means of a curved metal piece 10 is a piece of insulating material 9' which is also secured to th'eplate 8 and supports an electromagnet 11, the case 12 ,of which projects through the shelf 9 and beneath the vibrator arm 13 of the master vibrator M. In detail the master vibrator 14 comprises, in addition to the arm 13, a spring 15 rigidly secured to said arm and held in an adjusted position by means of a screw 16, a contact point 1'?" which is adapted for cooperation with a cont-act point 18 on an adjusting screw 19 that is mounted in a slotted arm 20 secured to plate 8, and a clamping screw 21. Also rigidly mounted on arm 13 is a pin 22 which projects through an aperture 23 in the spring leaf 15 and with which a coil spring 24 is connected, the opposite end of the spring being connected with a screw 25 slidably mounted in a bracket 26 on the shelf 9 and provided with a thumb nut 27 whereby the tension of the spring may be varied to draw the arm 13 into the V slot 28 of bracket 26 and the contact point 17 against contact point 18.

Pivotally mounted in the insulating member 9' and in a bracket 29 is a cylinder 30, of insulating material, which carries the switch lever 6 heretofore mentioned. Cyls inder 30' has a plurality of longitudinal grooves 31, all but one of which have metal inserts 3:2 of different lengths, dovetailed into the body .of the cylinder. Immediately back of the cylinder 30, and secured to the plate 8 by means of screws 33, are a plurality of brushes 3 & which angle outwardly and yieldingly take into grooves 31 and contact with the metal inserts or rest in the barren groove indicated by Ofl' on the outside of the casing.

.At one side of the'coil l1 and cylinder 30 is a condenser which is shunted in between the vibrator arm 13 and adjusting screw 19 to reduce the effects of self-induc tion in the coil 11 and thus prevent needles B, C and I) induction coils, each comprising soft lron coils 37 provided with primary and secondary windings 3S and 39 respectively,

vibrator arms 40 and adjusting screws (41 from the ground to the timer 36 and thenceto the primary windings of one of the coils A, B, C or D, through adjusting screw 41, vibrator arm 10, brushes Z) and (a and back to the battery.- This sets up a high tension current in the secondary coil 39, one end of which is grounded through the timer 36 on theengine frame, the other end being connected to the spark plug 44, a. portion of which is grounded and adapted to produce a'spark, If the switch lever is moved oppo; site the abbreviation Mag. the circuit is the same except that the current flows from the magneto 42 to the ground and so on. If, however, the switch is brought opposite the abbreviation M. V. the whole system changes. The vibrators of the several in- .duction coils cease to operate and a master vibrator is introduced into the main current so as to rapidly interrupt the current in flowing through any one of the primary coils 38. The circuit j ustreferred to starts from magneto 42, flows to the ground, from the ground to the timer 36, to the primary coil 38 and to the brush d. From brush d which has been connected to the brush it by one of the metal inserts 32 the current flows through the said insert and bru sh It to the coil 11, to the contact screw 19, vi-

brator arm l3.and back to the magneto, the condenser 35 being shunted in between the vibrator l3 and contact screw 19 for the purpose heretofore referred to.

It isapparent that a device of this character is particularly adapted for use on antomobiles, where the induced current is of high voltage and the vibrators so delicate that they often become inoperative owing to the fitting of the contact points.

With a device of this character a person may start the engine on the battery as is customary, and switch to the magneto. If, for any reason, the vibrators of the separate coils are not adjusted perfectly, causing the cylinders to. miss, the switch may be turned so as to bring the master vibrator into the current so that the engine may be run without interruption of delay and the other vibrators adjusted at leisure.

Having thus described my invention, what I claim as new therein and desire to secure by LettersPatent, is:

'1. In a device of the character described, a plurality of induction coils each having individual vibrator mechanism, a master vibrator, and a switch for simultaneously disconnecting said individual vibrator mechanism and introducing said master vibrator.

2. In a device of the character described, a plurality of inductor coils, each having individual vibrator mechanism, means for simultaneously introducing said coils into an electric circuit, a master vibrator, and a switch for simultaneously disconnecting the individual vibrator mechanism from and introducing the master vibrator into the electric circuit.

In testimony whereof I afiix my signature in presence of two witnesses.

FREDERICK B. JOHNSON. lVitnesses LEWIS L. MILLER, Ln'ra E. COATS. 

